Multipath slows down I/O to a disk

Solution Verified - Updated -


  • When issuing buffered I/O to a multipath device with a partition on it, it's much slower than writing to a single path of that multipathed device.
  • Writing to a multipath device with a partition is much faster when using direct-io.


  • Red Hat Enterprise Linux (RHEL) 6.x
  • Device-mapper multipath device
  • Partition on a device-mapper multipath device

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